<template>
    <div>
        <div class="search">
            <input v-model="keyword" class="search-input" type="text" placeholder="输入城市名或拼音" />
        </div>
        <div class="search-content" ref="search" v-show="keyword">
            <ul>
                <li class="search-item border-bottom" 
                v-for="item of list" 
                :key="item.id"
                @click="handleCityClick(item.name)"
                >
                {{item.name}}
            </li>
                <li class="search-item border-bottom" v-show="hasNoData">没有匹配到数据</li>
            </ul>
        </div>
    </div>

</template>

<script>
import Bscroll from 'better-scroll'
export default {
    nama: 'CitySearch',
    props: {
        cities: Object
    },
    data() {
        return {
            keyword: '',
            list: [],
            timer: null
        }
    },
    computed: {
        hasNoData (){
            return !this.list.length
        }
    },
    methods: {
        handleCityClick(city){
            /* 因为没有进行异步和同步操作，直接对mutations进行操作 */
            this.$store.commit('changeCity',city)
            this.$router.push('/')/* 使用router直接返回主页面 */
        }
    },
    watch: {
        keyword () {
            if (this.timer) {
                clearTimeout(this.timer)
            }
            if(!this.keyword){
                this.list=[]
                return
            }
            this.timer = setTimeout(() => {/* 当keyword发生改变时间隔100ms执行下面的操作 */
                const result = []
                for (let i in this.cities) {
                    this.cities[i].forEach((value) => {
                        if (value.spell.indexOf(this.keyword) > -1 ||/* 如果城市列表里有 */
                            value.name.indexOf(this.keyword) > -1) {
                            result.push(value)
                        }
                    });
                }
                this.list = result
            }, 100)
        }
    },
    /* 让搜索页面可以滚动 */
    mounted (){
        this.scroll=new Bscroll(this.$refs.search)
    }
}
</script>

<style lang="stylus" scoped>
    @import '../../../assets/styles/varibles.styl'
    .search
        background:$bgColor
        height: .72rem
        padding:.1rem
        .search-input
            box-sizing:border-box/* 使下面的padding起作用 */
            width:100%
            height:.62rem
            padding:.1rem/* 在文本框中输入文字时设置文字的内边距 */
            // text-height: .62rem
            text-align: center
            border-radius: .06rem
            color: #666
    .search-content
        background:#eee
        z-index: 1/* 层级优先级为1 */
        overflow:hidden
        position:absolute
        top:1.68rem
        left:0
        right:0
        bottom:0
        .search-item
            line-height: .62rem
            padding-left: .2rem
            background: #fff
            color: #666
</style>